A. B. Strout 105 
variation and not as a phenomenon characteristic of self-incompatible 
plants. 
Linum grandiflorum. 
Numerous tests for self-fertility have been made especially at the 
end of the period of bloom for both long- and short-styled plants of this 
species. Plants that made a vigorous growth in the field have been cut 
back, replanted in pots and grown during the winter in a-greenhouse. 
Such plants bloomed profusely in isolation and hundreds of self-pollina- 
tions were made by hand. All self-pollinations have failed conipletely. 
The species appears to be completely self-incompatible. All intra-form 
crosses which were made failed, but there was always marked fertility 
in inter-form crosses. The relations in crosses were however not ex-_ 
tensively tested. 
Cichorium Intybus. 
It should perhaps be stated here that the evidence already reported 
for wide variation in self-compatibility in this species does not involve 
a mingling of data collected at early and late periods of bloom, nor has 
there been any comparison between such data. An examination of the 
records for dates and periods of flowering shows that in no case have 
controlled pollinations been begun later than the tenth day after the first 
flower head opened, and that for 95°/, of all plants studied pollinations 
were begun during the first three days of bloom and continued over an 
interval which seldom extended to the mid-date of bloom. 
In the more robust races, and especially in the variety red-leaved 
Treviso, the period of blooming often continued until plants were killed 
by heavy frosts early in November. Toward the end of the period of 
- bloom relatively few flower heads open, and these are rather scattered. 
During the latter part of September and in October many flower heads 
open irregularly and poorly, and when plants are killed by frost the seed 
in many heads is immature. I have therefore never made any pollina- 
tions of this species later than the 6th of September. It has been most 
convenient, and it has afforded a most uniform treatment as well, to begin 
pollinations within the first three days of bloom and to continue until 
about the tenth day. Especially for the plants of the variety red-leaved 
Treviso this covered but a small part of the period of bloom. 
Controlled self-pollinations have been continued for a longer period 
than was the rule, in the case of certain plants found to be self-compatible 
and from which considerable seed for planting was desired. Seed pro- 
